Anyone have any experience with cellulose insulation?

Hi, I've been lurking around here for a couple of days and finding a lot of great information on this site as well as realizing that I have to really rethink my whole strategy for soundproofing my trailer (more on that at a later time, when I draw up a floor plan!). Anyway they sell this stuff at home depot and it seems like a good itch free alternative for filling the walls. http://www.cocooninsulation.com/ Also is compressed insulation considered air space? thanks in advance for your help. Pablo

Oh....I just realized someone just asked about the stuff... nevermind.